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<p>&#x9996;&#x5148;&#xFF0C;&#x7814;&#x7A76;ios&#x5FAA;&#x73AF;&#x5F15;&#x7528;&#xFF0C;&#x79BB;&#x4E0D;&#x5F00;&#x600E;&#x4E48;&#x4F7F;&#x7528;strong&#x548C;weak&#x7C7B;&#x578B;&#x7684;&#x5F15;&#x7528;&#x548C;mrc&#x4E0B;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x548C;arc&#x4E0B;&#x7684;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x3002;arc&#x7684;&#x89C4;&#x5219;&#x662F;&#xFF1A;&#x53EA;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x5F3A;&#x5F15;&#x7528;&#x6307;&#x5411;&#x5BF9;&#x8C61;&#xFF0C;&#x5BF9;&#x8C61;&#x5C31;&#x4F1A;&#x4FDD;&#x7559;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x3002;&#x5F53;&#x6307;&#x9488;&#x6307;&#x5411;&#x65B0;&#x503C;&#x6216;&#x8005;&#x8D4B;&#x503C;&#x4E3A;nil&#x65F6;&#xFF0C;&#x76F8;&#x5173;&#x8054;&#x7684;&#x5BF9;&#x8C61;&#x5C31;&#x4F1A;&#x81EA;&#x52A8;&#x91CA;&#x653E;&#x3002;&#x8FD9;&#x6761;&#x89C4;&#x5B9A;&#x4F7F;&#x7528;&#x4E8E;&#x5B9E;&#x4F8B;&#x53D8;&#x91CF;&#xFF0C;synthesize&#x5C5E;&#x6027;&#xFF0C;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x7B49;&#x3002;</p>
<p>arc&#x662F;&#x7F16;&#x8BD1;&#x5668;&#x7279;&#x6027;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x8FD0;&#x884C;&#x65F6;&#x7279;&#x6027;(&#x9664;&#x4E86;weak&#x6307;&#x9488;&#x7C7B;&#x578B;)&#xFF0C;arc&#x4E0D;&#x50CF;java,c#&#x8BED;&#x8A00;&#x4E2D;&#x7684;&#x5783;&#x573E;&#x56DE;&#x6536;&#x673A;&#x5236;&#x3002;</p>
<p>strong&#x7C7B;&#x578B;&#x7684;&#x6307;&#x9488;&#x662F;&#x5F3A;&#x5F15;&#x7528;&#xFF0C;&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x88AB;&#x5F3A;&#x5F15;&#x7528;&#xFF0C;&#x5219;&#x5BF9;&#x8C61;&#x4E0D;&#x4F1A;&#x88AB;&#x91CA;&#x653E;&#xFF1B;&#x4E0D;&#x7BA1;&#x6709;&#x591A;&#x5C11;weak&#x6307;&#x9488;&#x6307;&#x5411;&#x5BF9;&#x8C61;&#xFF0C;&#x53EA;&#x8981;&#x6CA1;&#x6709;&#x4E00;&#x4E2A;strong&#x6307;&#x9488;&#x6307;&#x5411;&#x5BF9;&#x8C61;&#xFF0C;&#x5219;&#x5BF9;&#x8C61;&#x5C31;&#x4F1A;&#x88AB;&#x91CA;&#x653E;&#xFF0C;weak&#x6307;&#x9488;&#x8D4B;&#x503C;&#x4E3A;nil(&#x4E0D;&#x6307;&#x5411;&#x4EFB;&#x4F55;&#x5B58;&#x50A8;&#x7A7A;&#x95F4;)&#x3002;</p>
<p>&#x7ECF;&#x5E38;&#x4F1A;&#x5FAA;&#x73AF;&#x5F15;&#x7528;&#x95EE;&#x9898;&#x7684;&#x5927;&#x81F4;&#x6709;&#x4EE5;&#x4E0B;&#x51E0;&#x79CD;&#x60C5;&#x51B5;&#xFF1A;</p>
<p>&#x4E00;&#xFF0C;&#x5047;&#x5982;&#x4F60;&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;A&#x7C7B;&#x548C;&#x4E00;&#x4E2A;B&#x7C7B;&#xFF0C;A&#x7C7B;&#x91CC;&#x9762;&#x6709;&#x4E00;&#x4E2A;B&#x7C7B;&#x7C7B;&#x578B;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x800C;B&#x7C7B;&#x91CC;&#x9762;&#x540C;&#x6837;&#x4E5F;&#x6709;&#x4E00;&#x4E2A;A&#x7C7B;&#x7C7B;&#x578B;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x5982;&#x679C;&#x8FD9;&#x4E24;&#x4E2A;&#x5C5E;&#x6027;&#x90FD;&#x662F;strong&#x4FEE;&#x9970;&#x7684;&#xFF0C;&#x90A3;&#x4E48;&#x5728;A&#x7C7B;&#x91CC;&#x9762;&#x8BBF;&#x95EE;B&#x7C7B;&#x5C5E;&#x6027;&#x548C;B&#x7C7B;&#x91CC;&#x8FB9;&#x8BBF;&#x95EE;A&#x7C7B;&#x5C5E;&#x6027;&#xFF0C;&#x90A3;&#x4E48;&#x5728;&#x5BF9;&#x8C61;&#x91CA;&#x653E;&#x7684;&#x65F6;&#x5019;&#x4F1A;&#x51FA;&#x73B0;&#x5FAA;&#x73AF;&#x5F15;&#x7528;&#x7684;&#x95EE;&#x9898;&#x3002;dealloc&#x65B9;&#x6CD5;&#x4E0D;&#x4F1A;&#x88AB;&#x8C03;&#x7528;&#x3002;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<p>#import  <foundation foundation.h=""></foundation></p>
<p>@class  B</p>
<p>@interface  A&#xFF1A;NSobject{</p>
<p>B*  bobj;</p>
<p>}</p>
<p>-(void)initWithObject:(B*)b&#xFF1B;</p>
<p>@end</p>
<p>#import    &quot;A.h&quot;</p>
<p>@interface  A()</p>
<p>@end</p>
<p>@implementation   A</p>
<p>-(void)initWithObject:(B*)b{</p>
<p>self.bobj=b;</p>
<p>}</p>
<p>@end</p>
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<p>[self dosomething]&#xFF1B;&#x6216;&#x8005;self.otherProperty=xxxx&#xFF1B;&#x6216;&#x8005;otherProperty=xxxxx&#xFF1B;</p>
<p>}&#xFF1B;</p>
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<p><img src="https:////upload-images.jianshu.io/upload_images/9687540-20777f50ca6215a1.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/609/format/webp" alt="img"></p>
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<p><img src="https:////upload-images.jianshu.io/upload_images/9687540-86a98ab8cef55672.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/683/format/webp" alt="img"></p>
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<p><img src="https:////upload-images.jianshu.io/upload_images/9687540-7983fbaf9c240526.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/663/format/webp" alt="img"></p>
<p>&#x5F53;&#x524D;&#x63A7;&#x5236;&#x5668;&#x505C;&#x7559;5&#x79D2;&#x4E4B;&#x540E;&#x8FD4;&#x56DE;&#x4E0A;&#x4E00;&#x7EA7;&#x7684;&#x6253;&#x5370;&#x7ED3;&#x679C;</p>
<p>&#x65E2;&#x7136;5&#x79D2;&#x4E4B;&#x5185;&#x8FD4;&#x56DE;&#x7684;&#x8BDD;&#xFF0C;&#x5C5E;&#x6027;&#x4F1A;&#x4F34;&#x968F;&#x7740;&#x63A7;&#x5236;&#x5668;&#x7684;&#x9500;&#x6BC1;&#x800C;&#x7F6E;&#x7A7A;&#xFF0C;&#x90A3;&#x4E48;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x6539;&#x6210;&#x8FD9;&#x6837;&#x5C31;&#x89E3;&#x51B3;&#x4E86;5&#x79D2;&#x4E4B;&#x5185;&#x8FD4;&#x56DE;&#x6253;&#x5370;&#x662F;null&#x7684;&#x95EE;&#x9898;</p>
<p><img src="https:////upload-images.jianshu.io/upload_images/9687540-2c20773a6310998e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/603/format/webp" alt="img"></p>
<p>&#x5F31;&#x5F15;&#x7528;&#x6539;&#x6210;&#x5F3A;&#x5F15;&#x7528;</p>
<p><img src="https:////upload-images.jianshu.io/upload_images/9687540-b281b3694cf9de92.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/671/format/webp" alt="img"></p>
<p>5&#x79D2;&#x4E4B;&#x5185;&#x6216;&#x8005;&#x4E4B;&#x540E;&#x7684;&#x6253;&#x5370;&#x7ED3;&#x679C;</p>
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<p>&#x4E09;&#xFF0C;&#x6570;&#x636E;&#x6E90;&#x534F;&#x8BAE;&#x548C;&#x59D4;&#x6258;&#x534F;&#x8BAE;&#x5C5E;&#x6027;delegate&#x4FEE;&#x9970;&#x7528;weak&#x5373;&#x53EF;&#x3002;</p>
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